Electronic register translator



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KEN/15TH M. HERO. Hau/ARD BAKER. 4DAV/D L. BENSON.

INVENTOR BY 7gg* ATTORNEY United States Patent 2,774,8l Patented Dec. 18, i956 nice ELECTRONIC REGISTER 'rnANsLAToR Kenneth Malcolm Heron, London, and Howard Baker mdl David Livingstone Benson, Surrey County, ling- Applicaon January 29, 1951, Serial No. 208384 14 Claims. (Cl. 179-18) This invention relates to apparatus of the kind which is arranged to provide desired information from stored information by correlating the stored information with received stimuli.

An example of such apparatus is to be found in calculating or computing apparatus in which a stimulus in the form of the argument of a mathematical function isl applied to the apparatus for the purpose of automatically calculating the value of the function which corresponds to the particular argument.

A further example of such apparatus is to be found in automatic or semi-automatic telephone systems in the form of register-translators to which a'stimulus consisting in a code by which an exchange or desircd'service s identified, is applied and which, on receipt of the stimulus, correlates items of information already stored therein with the code in such a manner as to emit, for example, the necessary switch settings designated by the code, the charge for a connection or serviceand the number of numerical digits which should follow the code.

As the subject matter is fairly complicated, the following specification is provided with headnotes to facilitate cross reference, which headnotes are here collected to form an index to the specication:

I. Objects and general comments.

II. Drawings.

Ill. Conventions.

IV. General arrangement (Fig. 2).

(a) Engaging and code digit reception. (b) Identifying code digit translations. (c) Sending translation digits. (d) Sending stored number digits.

Turning now to these subjects in order:

l. OBJECTS AND GENERAL COMMENTS An object of the present invention is to provide improved register-translator equipment for use in automatic or semi-automatic exchanges by the use of electronic techniques with resulting greater reliability in operation and reduction of maintenance costs.

It is well known that the function of the registertranslator is to receive all or part of the exchange code and the called subscribers number as dialled by a caller and to change all or part of the dialled-in digits intov another signal or series of signals which are best adapted to route the call towards its final destination. Registertranslator equipment at present in use translates the code portion of the called number into signals which direct the call to the wanted exchange or service or advance the call to a point in the telephone network where further registertranslator means are enabled to advance the call still further towards its destination. The numerical portion of the called number is not, in general, translated, and is stored by the register until such time as the code translation has advanced the call to the required exchange.

Known register-translator apparatus for automatic or semi-automatic telephone systems consist of three parts.

The first part, called the register receives and stores the dialled information, while thesecond, the translator, commonly takes the form of a cross-connection field of Wires which form a permanent memory of the information dening the route, and in some cases the charge for each code which may be dialled. The third part is a sender or counting circuit, which accepts information from the translator or from the numerical storage circuits and controls the setting of subsidiary apparatus in accordance with the information received for sending.

The high level of trac which has to be handled by automatic telephone exchanges results in heavy loading of common equipment such as register translators and it is a further object of the present invention to improve the reliability of such common equipment by utilisation of electronic techniques with resulting economy of components, and a lowering of maintenance costs.

According to the present invention automatic telephone exchange equipment or the like having two or more registers is provided with a single translator which serves as a permanent reference memory of all the items of information relating to all the codes for which its associated registers may require information and contains means whereby the said items of information may be offered sequentially to the registers` and sent only to such registers as require the informationand whose circuits are insuch a condition as to receive only the required items of information. j

Further according to the present invention automatic or semi-automatic telephone systems having two or more registers are provided with a single translator which is common to the registers and which comprises information recording means providing a permanent record of said information and adapted to produce continuously or on demand a series of electric signals each ofy which represents an item of the information and further means for successively reproducing thevarious items of said information as electric signals which are received and stored by the register only during such part of each cycle of transmission of signals by the said further means as is determined by the conditionv of the register consequent on the. reception thereby of signals produced other than by the translator, i.. e., calling signals.

it is known' in register translators for applications for translations to be made to the translator after xed numbers of complete digits have been received and stored in the register. lt is a lfeature of this invention that such applications may be made after the storage in the register of each or any of the incoming digits. The common tranlsator preferably is capable of signalling information to two or more registers simultaneously.

In particular equipment according to the invention and relating to register-translators forv use in automatic or semi-automatic .telephone-exchanges the register includes electronic storage elements for 4the storage of the information :comprising the codes and numerical information deiining the exchange' and number or the service required by the caller. Each storage element relating to the codes is joined over commoned wires to corresponding elements in other registers and to a common translator. Each register is further connected by means of commoned control wires to the single translator.

.lt is a feature of the linvention that the translator compri-ses a pulse generating and a pulse distributing circuit the two circuits cooperating to control electronic circuit elements corresponding in nunrber to the working. codes available to the registers associated v/ith the translator. These elements which will be designated collectively hereafter as the code ring are operated on in such a manner that each item of information indicated by a connection in a cross connection ieldv representing code and translation permanent information is normally offered in a pre- 

